BOWTHRUSTER – JASTRAM GmbH & Co KG
– Transverse Thrusters:
50 kW to 1650 kW
All major classifications
Unrivalled durable gears
4000 thrusters in operation
High-performance FP propellers
Jastram have been developing and producing transverse thrusters since 1950. Reliable gears, worldwide service, direct contact to our service department and detailed archived data for each delivered system are well accepted by the maritime industry and international shipping companies.
Jastram are specialised in fixed pitch propeller (FPP) thrusters which require minimal servicing due to their solidity and durability. To improve performance the propeller design is continuously modified according to the latest developments.
With electric drive systems ranging from the low-cost 3-step control for onshore manoeuvring to the frequency-controlled drive for offshore dynamic positioning Jastram offer transverse thrusters for a wide variety of vessel types.
The following table of Jastram thruster types indicates the maximum speed and power based on a 50Hz / 60Hz power supply and the German Lloyd type approval. ‘Max kW’ may differ for special applications and requirements of other classification societies.
The given thrust range in kN results from the calculation using the column ‘Max kW’ and is based on optimised tunnel, inlet cone and fore shapes. The range is influenced by the respective installation design.
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– Low-Noise Thrusters
Reduced cavitation noise
Recognised mega-yacht supplier
Resiliently mounted drive assembly
For transverse and azimuth grid thrusters
Active noise reduction
In the mid-fifties, when the first transverse thrusters were being delivered, Jastram were already working on technologies for noise reduction. Jastram applied for their first patent for a method for noise reduction in 1964. Scientific research was performed by ‘Jastram Forschung’ in the eighties in an in-house test basin and on board several vessels. These experimental series and measurements established the basis for the calculation of the Jastram noise reduction systems. Cavitation is one of the main sources of noise in tunnel thrusters and can be effectively reduced to 15dB(A) through active noise reduction. The mixture of air and water reduces the noise both inside and outside the vessel.
Jastram offers a choice of control systems for different prime mover variants with variable speed control:
The number of control panels or the number of interfaces to other systems installed on the vessel, e.g. Alarm monitoring system, Power management system, Dynamic positioning and Voyage data recorder, can be implemented according to customer specifications, thus ensuring a high level of flexibility to accommodate the space available in the bridge consoles.
The combined control lever allows thrust, thrust direction and gear shift to be controlled with a single lever.
Jastram’s control units are renowned for their safety, redundancy and their intuitive, easy operation.